コウ, けた

beam, girder, spar, unit or column (accounting)

JLPT0 G7 S10 F5000

As per 行# (straight and crossing) + tree/wood → straight and crossing beams/girders → *beam*; *girder* → *rack for hanging kimono*; *abacus bar* → *digit/(numerical) placeholder*.

[Full Kanji Etymology List]